//第二题
import java.util.Scanner;
public class M80502 {
    public static void main(String[] args) {
        Scanner in=new Scanner(System.in);
        System.out.println("请输入英寸：");
        double yc=in.nextDouble();
        double c=yc*2.54;
        System.out.println(String.format(c+"厘米"));
    }
}
